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1. Verify the validity of access token

   1. Return 401 in case validation fails

2. Check user scopes in order to perform this action (scope = 'merge_request:write')

   1. Return 403 in case invalid scope(s)

3. Check the employee has created this merge request. Thus select inserted_by from il.merge_requests of this merge request and compare it with user_id from the token.

4. Check that client_id from the token maches with il.merge_requests.legal_entity_id

   1. If not match - return 422 error (User doesn’t belong to legal entity where the merge request was created)

Validate digital signature

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Validate preperson as on create merge request process, but w/o searching pending merge requests and episodes.

Validate employee

Validate employee as described on reject merge request process.

Save signed merge request to media storage

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